Submission #3836

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
3836	2013-08-31T08:42:53 Z	imsifile	Cactus? Not cactus? (kriii1_C)	C++	0 / 1	32 ms	6728 KB

C

#include<stdio.h>
#include<stdlib.h>

int n, m, par[111111], lv[111111], go[111111];
int ecn, enp[222222], prv[222222], top[111111];
int scn, ix[111111], stk[111111], chk[111111];
int no, se[111111][2];

void edg(int s, int e){
	enp[ecn]=e, prv[ecn]=top[s], top[s]=ecn++;
}

void dfs(int k){
	int s, e;
	stk[scn++]=k, par[k]=-1, chk[k]=lv[k]=1, go[k]=k;
	no=0;
	while(scn){
		s=stk[scn-1];
		if(ix[s]==-1){
			scn--;
			if(par[s]!=-1){
				if(lv[go[par[s]]]>lv[go[s]])go[par[s]]=go[s];
			}
			continue;
		}
		e=enp[ix[s]], ix[s]=prv[ix[s]];
		if(e==par[s] || lv[e]>lv[s])continue;
		if(chk[e]){
			se[no][0]=s, se[no++][1]=e;
			if(lv[s]>lv[go[s]]){
				puts("Not cactus");
				exit(0);
			}
			go[s]=e;
			continue;
		}
		lv[e]=lv[s]+1, go[e]=e, par[e]=s;
		stk[scn++]=e, chk[e]=1;
	}
	int i;
	for(i=0; i<no; i++){
		if(go[se[i][0]] != se[i][1]){
			puts("Not cactus");
			exit(0);
		}
	}
}

int main(){
	int i, a, b;
	scanf("%d%d", &n, &m);
	for(i=0; i<n; i++)top[i]=-1;
	for(i=0; i<m; i++){
		scanf("%d%d", &a, &b), a--, b--;
		edg(a,b), edg(b,a);
	}
	for(i=0; i<n; i++)ix[i]=top[i];
	for(i=0; i<n; i++){
		if(chk[i])continue;
		dfs(i);
	}
	puts("Cactus");
	return 0;
}

Subtask #1

0.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	6728 KB	Output is correct
2	Correct	0 ms	6728 KB	Output is correct
3	Correct	0 ms	6728 KB	Output is correct
4	Correct	0 ms	6728 KB	Output is correct
5	Correct	0 ms	6728 KB	Output is correct
6	Correct	0 ms	6728 KB	Output is correct
7	Correct	0 ms	6728 KB	Output is correct
8	Correct	0 ms	6728 KB	Output is correct
9	Correct	0 ms	6728 KB	Output is correct
10	Correct	20 ms	6728 KB	Output is correct
11	Correct	16 ms	6728 KB	Output is correct
12	Correct	16 ms	6728 KB	Output is correct
13	Correct	28 ms	6728 KB	Output is correct
14	Correct	28 ms	6728 KB	Output is correct
15	Correct	28 ms	6728 KB	Output is correct
16	Correct	24 ms	6728 KB	Output is correct
17	Correct	20 ms	6728 KB	Output is correct
18	Correct	32 ms	6728 KB	Output is correct
19	Correct	32 ms	6728 KB	Output is correct
20	Correct	24 ms	6728 KB	Output is correct
21	Correct	28 ms	6728 KB	Output is correct
22	Correct	20 ms	6728 KB	Output is correct
23	Incorrect	0 ms	6728 KB	Output isn't correct
24	Halted	0 ms	0 KB	-